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NEUROLOGY 1994;44:294
© 1994 American Academy of Neurology

Improvement of left unilateral spatial neglect in a line extension task

S. Ishiai, MD, M. Sugishita, DMS, DHS, S. Watabiki, MD, T. Nakayama, MD, M. Kotera, MD and S. Gono, MD

Department of Rehabilitation (Dr. Ishiai), Tokyo Metropolitan Institute for Neuroscience, Tokyo; the Department of Cognitive Neuroscience (Dr. Sugishita), Research Institute of Logopedics and Phoniatrics, University of Tokyo, Tokyo; the Department of Neurology (Dr. Watabiki), Musashino Red Cross Hospital, Tokyo; the Department of Neurology (Drs. Nakayama and Kotera), Tsuchiura Kyodo General Hospital, Ibaraki; and the Department of Neurology (Dr. Gono), Kakeyu Hospital, Nagano, Japan.

Patients with left unilateral spatial neglect following lesions that mainly involved the right parietal lobe performed a line extension task, extending a horizontal line leftward to double its original length. We examined line extension performances in the left and right hemispaces, as well as in the midline, to assess whether spatial conditions affected these performances. Whatever the severity of neglect found in the line bisection test, the line extension performances of the patients were almost accurate and comparable with those of normal controls across the three spatial conditions. The neglect patients executed movements in or toward the contralesional space as the task oriented their attention sufficiently to the left. The results suggest that the motor component, ie, directional hypokinesia, has little part in left unilateral spatial neglect due to right parietal lesions.

Address correspondence and reprint requests to Dr. Sumio Ishiai, Department of Rehabilitation, Tokyo Metropolitan Institute for Neuroscience, 2-6 Musashidai, Fuchu City, Tokyo 183, Japan.

Received June 7, 1993. Accepted for publication in final form August 4,1993.




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